/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.constraintlayout.compose
import android.annotation.SuppressLint
import android.graphics.Matrix
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.AnimationSpec
import androidx.compose.animation.core.tween
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.LayoutScopeMarker
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.scale
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Path
import androidx.compose.ui.graphics.PathEffect
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.graphics.drawscope.translate
import androidx.compose.ui.graphics.nativeCanvas
import androidx.compose.ui.layout.*
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.*
import androidx.constraintlayout.core.motion.Motion
import androidx.constraintlayout.core.parser.CLParser
import androidx.constraintlayout.core.parser.CLParsingException
import androidx.constraintlayout.core.state.Dimension
import androidx.constraintlayout.core.state.Transition
import androidx.constraintlayout.core.state.WidgetFrame
import androidx.constraintlayout.core.widgets.Optimizer
import kotlinx.coroutines.channels.Channel
import org.intellij.lang.annotations.Language
import java.util.*
/**
* Layout that interpolate its children layout given two sets of constraint and
* a progress (from 0 to 1)
*/
@Suppress("NOTHING_TO_INLINE")
@Composable
inline fun MotionLayout(
start: ConstraintSet,
end: ConstraintSet,
transition: androidx.constraintlayout.compose.Transition? = null,
progress: Float,
debug: EnumSet<MotionLayoutDebugFlags> = EnumSet.of(MotionLayoutDebugFlags.NONE),
modifier: Modifier = Modifier,
optimizationLevel: Int = Optimizer.OPTIMIZATION_STANDARD,
crossinline content: @Composable MotionLayoutScope.() -> Unit
) {
MotionLayout(
start = start,
end = end,
transition = transition,
progress = progress,
debug = debug,
informationReceiver = null,
modifier = modifier,
optimizationLevel = optimizationLevel,
content = content
)
}
/**
* Layout that takes a MotionScene and animates by providing a [constraintSetName] to animate to.
*
* During recomposition, MotionLayout will interpolate from whichever ConstraintSet it is currently
* in, to [constraintSetName].
*
* Typically the first value of [constraintSetName] should match the start ConstraintSet in the
* default transition, or be null.
*
* Animation is run by [animationSpec], and will only start another animation once any other ones
* are finished. Use [finishedAnimationListener] to know when a transition has stopped.
*/
@Composable
inline fun MotionLayout(
motionScene: MotionScene,
constraintSetName: String? = null,
animationSpec: AnimationSpec<Float> = tween<Float>(),
debug: EnumSet<MotionLayoutDebugFlags> = EnumSet.of(MotionLayoutDebugFlags.NONE),
modifier: Modifier = Modifier,
optimizationLevel: Int = Optimizer.OPTIMIZATION_STANDARD,
noinline finishedAnimationListener: (() -> Unit)? = null,
crossinline content: @Composable (MotionLayoutScope.() -> Unit)
) {
val needsUpdate = remember {
mutableStateOf(0L)
}
motionScene.setUpdateFlag(needsUpdate)
var usedDebugMode = debug
if (motionScene.getForcedDrawDebug() != MotionLayoutDebugFlags.UNKNOWN) {
usedDebugMode = EnumSet.of(motionScene.getForcedDrawDebug())
}
val transitionContent = remember(motionScene, needsUpdate.value) {
motionScene.getTransition("default")
}
val transition: androidx.constraintlayout.compose.Transition? =
transitionContent?.let { Transition(it) }
val startId = transition?.getStartConstraintSetId() ?: "start"
val endId = transition?.getEndConstraintSetId() ?: "end"
val startContent = remember(motionScene, needsUpdate.value) {
motionScene.getConstraintSet(startId) ?: motionScene.getConstraintSet(0)
}
val endContent = remember(motionScene, needsUpdate.value) {
motionScene.getConstraintSet(endId) ?: motionScene.getConstraintSet(1)
}
val targetEndContent = remember(motionScene, constraintSetName) {
constraintSetName?.let { motionScene.getConstraintSet(constraintSetName) }
}
if (startContent == null || endContent == null) {
return
}
var start: ConstraintSet by remember(motionScene) { mutableStateOf(JSONConstraintSet(content = startContent)) }
var end: ConstraintSet by remember(motionScene) { mutableStateOf(JSONConstraintSet(content = endContent)) }
val targetConstraintSet = targetEndContent?.let { JSONConstraintSet(targetEndContent) }
val progress = remember { Animatable(0f) }
var animateToEnd by remember(motionScene) { mutableStateOf(true) }
val channel = remember { Channel<ConstraintSet>(Channel.CONFLATED) }
if (targetConstraintSet != null) {
SideEffect {
channel.trySend(targetConstraintSet)
}
LaunchedEffect(motionScene, channel) {
for (constraints in channel) {
val newConstraintSet = channel.tryReceive().getOrNull() ?: constraints
val animTargetValue = if (animateToEnd) 1f else 0f
val currentSet = if (animateToEnd) start else end
if (newConstraintSet != currentSet) {
if (animateToEnd) {
end = newConstraintSet
} else {
start = newConstraintSet
}
progress.animateTo(animTargetValue, animationSpec)
animateToEnd = !animateToEnd
finishedAnimationListener?.invoke()
}
}
}
}
val lastOutsideProgress = remember { mutableStateOf(0f) }
val forcedProgress = motionScene.getForcedProgress()
val currentProgress =
if (!forcedProgress.isNaN() && lastOutsideProgress.value == progress.value) {
forcedProgress
} else {
motionScene.resetForcedProgress()
progress.value
}
lastOutsideProgress.value = progress.value
MotionLayout(
start = start,
end = end,
transition = transition,
progress = currentProgress,
debug = usedDebugMode,
informationReceiver = motionScene as? JSONMotionScene,
modifier = modifier,
optimizationLevel = optimizationLevel,
content = content
)
}
@Composable
inline fun MotionLayout(
start: ConstraintSet,
end: ConstraintSet,
transition: androidx.constraintlayout.compose.Transition? = null,
progress: Float,
debug: EnumSet<MotionLayoutDebugFlags> = EnumSet.of(MotionLayoutDebugFlags.NONE),
informationReceiver: LayoutInformationReceiver? = null,
modifier: Modifier = Modifier,
optimizationLevel: Int = Optimizer.OPTIMIZATION_STANDARD,
crossinline content: @Composable MotionLayoutScope.() -> Unit
) {
val measurer = remember { MotionMeasurer() }
val scope = remember { MotionLayoutScope(measurer) }
val progressState = remember { mutableStateOf(0f) }
SideEffect { progressState.value = progress }
val measurePolicy =
rememberMotionLayoutMeasurePolicy(
optimizationLevel,
debug,
0,
start,
end,
transition,
progressState,
measurer
)
measurer.addLayoutInformationReceiver(informationReceiver)
val forcedScaleFactor = measurer.forcedScaleFactor
if (!debug.contains(MotionLayoutDebugFlags.NONE) || !forcedScaleFactor.isNaN()) {
var mod = modifier
if (!forcedScaleFactor.isNaN()) {
mod = modifier.scale(measurer.forcedScaleFactor)
}
Box {
@Suppress("DEPRECATION")
(MultiMeasureLayout(
modifier = mod.semantics { designInfoProvider = measurer },
measurePolicy = measurePolicy,
content = { scope.content() }
))
with(measurer) {
if (!forcedScaleFactor.isNaN()) {
drawDebugBounds(forcedScaleFactor)
}
if (!debug.contains(MotionLayoutDebugFlags.NONE)) {
drawDebug()
}
}
}
} else {
@Suppress("DEPRECATION")
(MultiMeasureLayout(
modifier = modifier.semantics { designInfoProvider = measurer },
measurePolicy = measurePolicy,
content = { scope.content() }
))
}
}
@Suppress("NOTHING_TO_INLINE")
@Composable
inline fun MotionLayout(
motionScene: MotionScene,
progress: Float,
debug: EnumSet<MotionLayoutDebugFlags> = EnumSet.of(MotionLayoutDebugFlags.NONE),
modifier: Modifier = Modifier,
optimizationLevel: Int = Optimizer.OPTIMIZATION_STANDARD,
crossinline content: @Composable (MotionLayoutScope.() -> Unit),
) {
val needsUpdate = remember {
mutableStateOf(0L)
}
motionScene.setUpdateFlag(needsUpdate)
var usedDebugMode = debug
if (motionScene.getForcedDrawDebug() != MotionLayoutDebugFlags.UNKNOWN) {
usedDebugMode = EnumSet.of(motionScene.getForcedDrawDebug())
}
val transitionContent = remember(motionScene, needsUpdate.value) {
motionScene.getTransition("default")
}
val transition: androidx.constraintlayout.compose.Transition? =
transitionContent?.let { Transition(it) }
val startId = transition?.getStartConstraintSetId() ?: "start"
val endId = transition?.getEndConstraintSetId() ?: "end"
val startContent = remember(motionScene, needsUpdate.value) {
motionScene.getConstraintSet(startId) ?: motionScene.getConstraintSet(0)
}
val endContent = remember(motionScene, needsUpdate.value) {
motionScene.getConstraintSet(endId) ?: motionScene.getConstraintSet(1)
}
if (startContent == null || endContent == null) {
return
}
val start = ConstraintSet(startContent)
val end = ConstraintSet(endContent)
var lastOutsideProgress by remember {
mutableStateOf(0f)
}
val forcedProgress = motionScene.getForcedProgress()
var usedProgress = progress
if (!forcedProgress.isNaN() && lastOutsideProgress == progress) {
usedProgress = forcedProgress
} else {
motionScene.resetForcedProgress()
}
@Suppress("UNUSED_VALUE")
lastOutsideProgress = progress
val measurer = remember { MotionMeasurer() }
val scope = remember { MotionLayoutScope(measurer) }
val progressState = remember { mutableStateOf(0f) }
SideEffect { progressState.value = usedProgress }
val measurePolicy =
rememberMotionLayoutMeasurePolicy(
optimizationLevel,
usedDebugMode,
needsUpdate.value,
start,
end,
transition,
progressState,
measurer
)
measurer.addLayoutInformationReceiver(motionScene as JSONMotionScene)
val forcedScaleFactor = measurer.forcedScaleFactor
if (!debug.contains(MotionLayoutDebugFlags.NONE) || !forcedScaleFactor.isNaN()) {
var mod = modifier
if (!forcedScaleFactor.isNaN()) {
mod = modifier.scale(measurer.forcedScaleFactor)
}
Box {
@Suppress("DEPRECATION")
(MultiMeasureLayout(
modifier = mod.semantics { designInfoProvider = measurer },
measurePolicy = measurePolicy,
content = { scope.content() }
))
with(measurer) {
if (!forcedScaleFactor.isNaN()) {
drawDebugBounds(forcedScaleFactor)
}
if (!debug.contains(MotionLayoutDebugFlags.NONE)) {
drawDebug()
}
}
}
} else {
@Suppress("DEPRECATION")
(MultiMeasureLayout(
modifier = modifier.semantics { designInfoProvider = measurer },
measurePolicy = measurePolicy,
content = { scope.content() }
))
}
}
@Immutable
interface MotionScene {
fun setConstraintSetContent(name: String, content: String)
fun setTransitionContent(name: String, content: String)
fun getConstraintSet(name: String): String?
fun getConstraintSet(index: Int): String?
fun getTransition(name: String): String?
fun setUpdateFlag(needsUpdate: MutableState<Long>)
fun setDebugName(name: String?)
fun getForcedProgress(): Float
fun resetForcedProgress()
fun getForcedDrawDebug(): MotionLayoutDebugFlags
}
class JSONMotionScene(@Language("json5") content: String) : EditableJSONLayout(content),
MotionScene {
private val constraintSetsContent = HashMap<String, String>()
private val transitionsContent = HashMap<String, String>()
private var forcedProgress: Float = Float.NaN
init {
// call parent init here so that hashmaps are created
initialization()
}
///////////////////////////////////////////////////////////////////////////
// Accessors
///////////////////////////////////////////////////////////////////////////
override fun setConstraintSetContent(name: String, content: String) {
constraintSetsContent[name] = content
}
override fun setTransitionContent(name: String, content: String) {
transitionsContent[name] = content
}
override fun getConstraintSet(name: String): String? {
return constraintSetsContent[name]
}
override fun getConstraintSet(index: Int): String? {
return constraintSetsContent.values.elementAtOrNull(index)
}
override fun getTransition(name: String): String? {
return transitionsContent[name]
}
override fun getForcedProgress(): Float {
return forcedProgress;
}
override fun resetForcedProgress() {
forcedProgress = Float.NaN
}
///////////////////////////////////////////////////////////////////////////
// on update methods
///////////////////////////////////////////////////////////////////////////
override fun onNewContent(content: String) {
super.onNewContent(content)
try {
parseMotionSceneJSON(this, content);
} catch (e: Exception) {
// nothing (content might be invalid, sent by live edit)
}
}
override fun onNewProgress(progress: Float) {
forcedProgress = progress
signalUpdate()
}
}
@SuppressLint("ComposableNaming")
@Composable
fun MotionScene(@Language("json5") content: String): MotionScene {
return remember(content) {
JSONMotionScene(content)
}
}
@LayoutScopeMarker
class MotionLayoutScope @PublishedApi internal constructor(measurer: MotionMeasurer) {
private var myMeasurer = measurer
class MotionProperties internal constructor(
id: String,
tag: String?,
measurer: MotionMeasurer
) {
private var myId = id
private var myTag = null
private var myMeasurer = measurer
fun id(): String {
return myId
}
fun tag(): String? {
return myTag
}
fun color(name: String): Color {
return myMeasurer.getCustomColor(myId, name)
}
fun float(name: String): Float {
return myMeasurer.getCustomFloat(myId, name)
}
fun int(name: String): Int {
return myMeasurer.getCustomFloat(myId, name).toInt()
}
fun distance(name: String): Dp {
return myMeasurer.getCustomFloat(myId, name).dp
}
fun fontSize(name: String): TextUnit {
return myMeasurer.getCustomFloat(myId, name).sp
}
}
@Composable
fun motionProperties(id: String): MutableState<MotionProperties> = remember {
mutableStateOf(MotionProperties(id, null, myMeasurer))
}
fun motionProperties(id: String, tag: String): MotionProperties {
return MotionProperties(id, tag, myMeasurer)
}
fun motionColor(id: String, name: String): Color {
return myMeasurer.getCustomColor(id, name)
}
fun motionFloat(id: String, name: String): Float {
return myMeasurer.getCustomFloat(id, name)
}
fun motionInt(id: String, name: String): Int {
return myMeasurer.getCustomFloat(id, name).toInt()
}
fun motionDistance(id: String, name: String): Dp {
return myMeasurer.getCustomFloat(id, name).dp
}
fun motionFontSize(id: String, name: String): TextUnit {
return myMeasurer.getCustomFloat(id, name).sp
}
}
@Immutable
interface Transition {
fun applyTo(transition: Transition, type: Int)
fun getStartConstraintSetId(): String
fun getEndConstraintSetId(): String
}
@SuppressLint("ComposableNaming")
@Composable
fun Transition(@Language("json5") content: String): androidx.constraintlayout.compose.Transition? {
val transition = remember(content) {
val parsed = try {
CLParser.parse(content)
} catch (e: CLParsingException) {
System.err.println("Error parsing JSON $e")
null
}
mutableStateOf(
if (parsed != null) {
object : androidx.constraintlayout.compose.Transition {
override fun applyTo(transition: Transition, type: Int) {
try {
parseTransition(parsed, transition)
} catch (e: CLParsingException) {
System.err.println("Error parsing JSON $e")
}
}
override fun getStartConstraintSetId(): String {
return parsed.getStringOrNull("from") ?: "start"
}
override fun getEndConstraintSetId(): String {
return parsed.getStringOrNull("to") ?: "end"
}
}
} else {
null
}
)
}
return transition.value
}
enum class MotionLayoutDebugFlags {
NONE,
SHOW_ALL,
UNKNOWN
}
enum class LayoutInfoFlags {
NONE,
BOUNDS
}
@Composable
@PublishedApi
internal fun rememberMotionLayoutMeasurePolicy(
optimizationLevel: Int,
debug: EnumSet<MotionLayoutDebugFlags>,
needsUpdate: Long,
constraintSetStart: ConstraintSet,
constraintSetEnd: ConstraintSet,
transition: androidx.constraintlayout.compose.Transition?,
progress: MutableState<Float>,
measurer: MotionMeasurer
) = remember(
optimizationLevel,
debug,
needsUpdate,
constraintSetStart,
constraintSetEnd,
transition
) {
measurer.initWith(constraintSetStart, constraintSetEnd, transition, progress.value)
MeasurePolicy { measurables, constraints ->
val layoutSize = measurer.performInterpolationMeasure(
constraints,
layoutDirection,
constraintSetStart,
constraintSetEnd,
transition,
measurables,
optimizationLevel,
progress.value,
this
)
layout(layoutSize.width, layoutSize.height) {
with(measurer) {
performLayout(measurables)
}
}
}
}
@PublishedApi
internal class MotionMeasurer : Measurer() {
private var motionProgress = 0f
val transition = Transition()
fun getProgress(): Float {
return motionProgress
}
private fun measureConstraintSet(
optimizationLevel: Int, constraintSetStart: ConstraintSet,
measurables: List<Measurable>, constraints: Constraints
) {
state.reset()
constraintSetStart.applyTo(state, measurables)
state.apply(root)
applyRootSize(constraints)
root.updateHierarchy()
if (DEBUG) {
root.debugName = "ConstraintLayout"
root.children.forEach { child ->
child.debugName =
(child.companionWidget as? Measurable)?.layoutId?.toString() ?: "NOTAG"
}
}
root.children.forEach { child ->
val measurable = (child.companionWidget as? Measurable)
val id = measurable?.layoutId ?: measurable?.constraintLayoutId
child.stringId = id?.toString()
}
root.optimizationLevel = optimizationLevel
// No need to set sizes and size modes as we passed them to the state above.
root.measure(Optimizer.OPTIMIZATION_NONE, 0, 0, 0, 0, 0, 0, 0, 0)
}
fun performInterpolationMeasure(
constraints: Constraints,
layoutDirection: LayoutDirection,
constraintSetStart: ConstraintSet,
constraintSetEnd: ConstraintSet,
transition: androidx.constraintlayout.compose.Transition?,
measurables: List<Measurable>,
optimizationLevel: Int,
progress: Float,
measureScope: MeasureScope
): IntSize {
this.density = measureScope
this.measureScope = measureScope
var layoutSizeChanged = false
if (constraints.hasFixedWidth
&& !state.sameFixedWidth(constraints.maxWidth)
) {
layoutSizeChanged = true
}
if (constraints.hasFixedHeight
&& !state.sameFixedHeight(constraints.maxHeight)
) {
layoutSizeChanged = true
}
if (motionProgress != progress
|| (layoutInformationReceiver?.getForcedWidth() != Int.MIN_VALUE
&& layoutInformationReceiver?.getForcedHeight() != Int.MIN_VALUE)
|| this.transition.isEmpty()
|| frameCache.isEmpty()
|| layoutSizeChanged
) {
motionProgress = progress
if (layoutSizeChanged || this.transition.isEmpty() || frameCache.isEmpty()) {
this.transition.clear()
resetMeasureState()
state.reset()
// Define the size of the ConstraintLayout.
state.width(
if (constraints.hasFixedWidth) {
Dimension.Fixed(constraints.maxWidth)
} else {
Dimension.Wrap().min(constraints.minWidth)
}
)
state.height(
if (constraints.hasFixedHeight) {
Dimension.Fixed(constraints.maxHeight)
} else {
Dimension.Wrap().min(constraints.minHeight)
}
)
// Build constraint set and apply it to the state.
state.rootIncomingConstraints = constraints
state.layoutDirection = layoutDirection
measureConstraintSet(
optimizationLevel,
constraintSetStart,
measurables,
constraints
)
this.transition.updateFrom(root, Transition.START)
measureConstraintSet(optimizationLevel, constraintSetEnd, measurables, constraints)
this.transition.updateFrom(root, Transition.END)
if (transition != null) {
transition.applyTo(this.transition, 0)
}
}
this.transition.interpolate(root.width, root.height, progress)
var index = 0
for (child in root.children) {
val measurable = child.companionWidget
if (measurable !is Measurable) continue
var interpolatedFrame = this.transition.getInterpolated(child)
if (interpolatedFrame == null) {
continue
}
val placeable = placeables[measurable]
val currentWidth = placeable?.width
val currentHeight = placeable?.height
if (placeable == null
|| currentWidth != interpolatedFrame.width()
|| currentHeight != interpolatedFrame.height()
) {
measurable.measure(
Constraints.fixed(interpolatedFrame.width(), interpolatedFrame.height())
)
.also {
placeables[measurable] = it
}
}
frameCache[measurable] = interpolatedFrame
index++
}
if (layoutInformationReceiver?.getLayoutInformationMode() == LayoutInfoFlags.BOUNDS) {
computeLayoutResult()
}
}
return IntSize(root.width, root.height)
}
private fun encodeKeyFrames(
json: StringBuilder,
location: FloatArray,
types: IntArray,
progress: IntArray,
count: Int
) {
if (count == 0) {
return
}
json.append("keyTypes : [")
for (i in 0 until count) {
val m = types[i]
json.append(" $m,")
}
json.append("],\n")
json.append("keyPos : [")
for (i in 0 until count * 2) {
val f = location[i]
json.append(" $f,")
}
json.append("],\n ")
json.append("keyFrames : [")
for (i in 0 until count) {
val f = progress[i]
json.append(" $f,")
}
json.append("],\n ")
}
fun encodeRoot(json: StringBuilder) {
json.append(" root: {")
json.append("interpolated: { left: 0,")
json.append(" top: 0,")
json.append(" right: ${root.width} ,")
json.append(" bottom: ${root.height} ,")
json.append(" } }")
}
override fun computeLayoutResult() {
val json = StringBuilder()
json.append("{ ")
encodeRoot(json)
val mode = IntArray(50)
val pos = IntArray(50)
var key = FloatArray(100)
for (child in root.children) {
val start = transition.getStart(child.stringId)
val end = transition.getEnd(child.stringId)
val interpolated = transition.getInterpolated(child.stringId)
val path = transition.getPath(child.stringId)
val count = transition.getKeyFrames(child.stringId, key, mode, pos)
json.append(" ${child.stringId}: {")
json.append(" interpolated : ")
interpolated.serialize(json, true);
json.append(", start : ")
start.serialize(json);
json.append(", end : ")
end.serialize(json);
encodeKeyFrames(json, key, mode, pos, count)
json.append(" path : [")
for (point in path) {
json.append(" $point ,")
}
json.append(" ] ")
json.append("}, ")
}
json.append(" }")
layoutInformationReceiver?.setLayoutInformation(json.toString())
}
@Composable
fun BoxScope.drawDebug() {
Canvas(modifier = Modifier.matchParentSize()) {
var index = 0
val pathEffect = PathEffect.dashPathEffect(floatArrayOf(10f, 10f), 0f)
for (child in root.children) {
val startFrame = transition.getStart(child)
val endFrame = transition.getEnd(child)
translate(2f, 2f) {
drawFrameDebug(
size.width,
size.height,
startFrame,
endFrame,
pathEffect,
Color.White
)
}
drawFrameDebug(
size.width,
size.height,
startFrame,
endFrame,
pathEffect,
Color.Blue
)
index++
}
}
}
private fun DrawScope.drawFrameDebug(
parentWidth: Float,
parentHeight: Float,
startFrame: WidgetFrame,
endFrame: WidgetFrame,
pathEffect: PathEffect,
color: Color
) {
drawFrame(startFrame, pathEffect, color)
drawFrame(endFrame, pathEffect, color)
var numKeyPositions = transition.getNumberKeyPositions(startFrame)
var debugRender = MotionRenderDebug(23f);
debugRender.draw(
drawContext.canvas.nativeCanvas, transition.getMotion(startFrame.widget.stringId),
1000, Motion.DRAW_PATH_BASIC,
parentWidth.toInt(), parentHeight.toInt()
)
if (numKeyPositions == 0) {
// drawLine(
// start = Offset(startFrame.centerX(), startFrame.centerY()),
// end = Offset(endFrame.centerX(), endFrame.centerY()),
// color = color,
// strokeWidth = 3f,
// pathEffect = pathEffect
// )
} else {
var x = FloatArray(numKeyPositions)
var y = FloatArray(numKeyPositions)
var pos = FloatArray(numKeyPositions)
transition.fillKeyPositions(startFrame, x, y, pos)
var prex = startFrame.centerX()
var prey = startFrame.centerY()
for (i in 0..numKeyPositions - 1) {
var keyFrameProgress = pos[i] / 100f
var frameWidth =
((1 - keyFrameProgress) * startFrame.width()) + (keyFrameProgress * endFrame.width())
var frameHeight =
((1 - keyFrameProgress) * startFrame.height()) + (keyFrameProgress * endFrame.height())
var curX = x[i] * parentWidth + frameWidth / 2f
var curY = y[i] * parentHeight + frameHeight / 2f
// drawLine(
// start = Offset(prex, prey),
// end = Offset(curX, curY),
// color = color,
// strokeWidth = 3f,
// pathEffect = pathEffect
// )
var path = Path()
var pathSize = 20f
path.moveTo(curX - pathSize, curY)
path.lineTo(curX, curY + pathSize)
path.lineTo(curX + pathSize, curY)
path.lineTo(curX, curY - pathSize)
path.close()
var stroke = Stroke(width = 3f)
drawPath(path, color, 1f, stroke)
prex = curX
prey = curY
}
// drawLine(
// start = Offset(prex, prey),
// end = Offset(endFrame.centerX(), endFrame.centerY()),
// color = color,
// strokeWidth = 3f,
// pathEffect = pathEffect
// )
}
}
private fun DrawScope.drawFrame(
frame: WidgetFrame,
pathEffect: PathEffect,
color: Color
) {
if (frame.isDefaultTransform) {
var drawStyle = Stroke(width = 3f, pathEffect = pathEffect)
drawRect(
color, Offset(frame.left.toFloat(), frame.top.toFloat()),
Size(frame.width().toFloat(), frame.height().toFloat()), style = drawStyle
)
} else {
var matrix = Matrix()
if (!frame.rotationZ.isNaN()) {
matrix.preRotate(frame.rotationZ, frame.centerX(), frame.centerY())
}
var scaleX = if (frame.scaleX.isNaN()) 1f else frame.scaleX
var scaleY = if (frame.scaleY.isNaN()) 1f else frame.scaleY
matrix.preScale(
scaleX,
scaleY,
frame.centerX(),
frame.centerY()
)
var points = floatArrayOf(
frame.left.toFloat(), frame.top.toFloat(),
frame.right.toFloat(), frame.top.toFloat(),
frame.right.toFloat(), frame.bottom.toFloat(),
frame.left.toFloat(), frame.bottom.toFloat()
)
matrix.mapPoints(points)
drawLine(
start = Offset(points[0], points[1]),
end = Offset(points[2], points[3]),
color = color,
strokeWidth = 3f,
pathEffect = pathEffect
)
drawLine(
start = Offset(points[2], points[3]),
end = Offset(points[4], points[5]),
color = color,
strokeWidth = 3f,
pathEffect = pathEffect
)
drawLine(
start = Offset(points[4], points[5]),
end = Offset(points[6], points[7]),
color = color,
strokeWidth = 3f,
pathEffect = pathEffect
)
drawLine(
start = Offset(points[6], points[7]),
end = Offset(points[0], points[1]),
color = color,
strokeWidth = 3f,
pathEffect = pathEffect
)
}
}
fun getCustomColor(id: String, name: String): Color {
if (!transition.contains(id)) {
return Color.Black
}
transition.interpolate(root.width, root.height, motionProgress)
val interpolatedFrame = transition.getInterpolated(id)
val color = interpolatedFrame.getCustomColor(name)
return Color(color);
}
fun getCustomFloat(id: String, name: String): Float {
if (!transition.contains(id)) {
return 0f;
}
val startFrame = transition.getStart(id)
val endFrame = transition.getEnd(id)
val startFloat = startFrame.getCustomFloat(name)
val endFloat = endFrame.getCustomFloat(name)
return (1f - motionProgress) * startFloat + motionProgress * endFloat
}
fun clearConstraintSets() {
transition.clear()
frameCache.clear()
}
fun initWith(
start: ConstraintSet,
end: ConstraintSet,
transition: androidx.constraintlayout.compose.Transition?,
progress: Float
) {
clearConstraintSets()
start.applyTo(this.transition, Transition.START)
end.applyTo(this.transition, Transition.END)
this.transition.interpolate(0, 0, progress)
transition?.applyTo(this.transition, 0)
}
}
private val DEBUG = false